The document provides instructions and solutions for calculating unknown angles in 5 diagrams. It asks the reader to calculate the measure of angles marked with "?" in each diagram. The corrections then show the calculations to determine that the unknown angles are 67 degrees in diagram 1, 55 degrees in diagram 2, 70 degrees in diagram 3, 45 degrees in diagram 4, and 60 degrees in diagram 5.

1. Calcul mental “Angle et triangle” série n°2

2. Pour chaque diapositive, calculer la mesure de l’angle marqué par « ? »

3. ? 53° 67° Diapositive 1

4. ? 35° Diapositive 2

5. ? 70° Diapositive 3

6. ? Diapositive 4

7. ? Diapositive 5

8. FIN

9. CORRECTION

10. ? 53° 67° 67° + 53° = 120° 180° – 120° = 60° Diapositive 1

11. ? 53° 67° 67° + 53° = 120° 180° – 120° = 60° Diapositive 1

12. ? 53° 67° 67° + 53° = 120° 180° – 120° = 60° Diapositive 1

13. 60° 53° 67° 67° + 53° = 120° 180° – 120° = 60° Diapositive 1

14. ? 35° 90° – 35° = 55° Diapositive 2

15. ? 35° 90° – 35° = Diapositive 2

16. 55° 35° 90° – 35° = 55° Diapositive 2

17. ? 70° Diapositive 3

18. ? 70° Diapositive 3 70°

19. ? 70° Diapositive 3 70°

20. 40° 70° Diapositive 3 70°

21. ? Diapositive 4

22. ? Diapositive 4 ?

23. ? Diapositive 4 ?

24. 45° Diapositive 4 45°

25. ? Diapositive 5

26. ? Diapositive 5 ? ?

27. ? Diapositive 5 ? ?

28. 60° Diapositive 5 60° 60°